As a big brandy and cognac fan, I take it as a mission to Shepard the wonderful flavour of the sprit.
The cognac and the coffee are quite explicit in their flavours of bitter and heat, but the sweetness of the chestnut liqueur and Mr.Black leave a wonderful taste of a slight sweetness on the lips.
Into a mixing glass add all ingredients and then ice.
Stir till chilled.
Strain and serve in coup.
Garnish with raisins or chestnuts.